<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
     <!-- 特殊字符 -->
      <p style='border:1px red solid'> p&nbsp;&nbsp;p</p>
      <p>3<5</p>
      <p> 3&lt;5</p>
      <p> 5 &gt;3</p>

      <p>&amp</p>
      <p>&copy;</p>
      <p>&reg;</p>

      <hr>

      <h1>&hearts;</h1>
      <h1>&spades;</h1>
      <h1>&clubs;</h1>
      <h1>&diams;</h1>

<a href="">哈哈哈</a> <span>span，哈哈哈哈</span>
<img src="study/images/1.jpg" alt="">

</body>
</html>